22 AUSTRALASIAN ANTARCTIC EXPEDITION. 
BAIRDIA ACANTHIGERA G. S. Brady. 
Bairdia acanthigera G. S. Brady, 1880, Rep. Chall. Zool., vol. I, pt. IU, p. 61, 
pl. IX, figs. 4a-c. 
Observations. —The present is an entirely new area for this species. The speci- 
mens are typical but rare. All separate valves. 
Occurrence—No. 59 (12th December, 1912), 1,320 fathoms. No. 60 (12th 
December, 1912), 1,300 fathoms. 
BAIRDIA AMYGDALOIDES G. S. Brady. Plate XXI, fig. 5. 
Bairdia amygdaloides G. 8. Brady, 1865, Trans. Zool. Soc. Lond., vol. V, p. 364, 
pl LVIL, figs. 6a-c. 
Bairdia de wattrei, Id. 1868, Les Fonds de la Mer, p. 199, pl. X XVII, figs. 
17, 18. 
Bairdia amygdaloides G. 8. Brady, 1880, Rep. Chall. Zool., vol. I, pt. III, p. 54, 
pl. IX, figs 5a-f; pl. X, figs. 2a-c. Chapman, 1910, Proc. R. Soc. Vict., vol. XXII 
(N.S), pt. II, p. 307. Idem, 1914, ibid, p. 31, pl. VI, fig. 6. Idem, 1915, Scientific 
Results ‘‘ Endeavour,” vol. ITI. pt. I, p. 38. 
Observations—This austral form is widely distributed in the Southern hemi- 
sphere and is found fossil as far back as the Miocene. The present recorded depth of 
1,320 fathoms is the deepest known for this species. The specimen from that sounding 
is small and thin-shelled, but otherwise typical. 
Occurrence.—No. 31 (15th February, 1912), 220 fathoms. No. 58 (11th December, 
1912), 1,180 fathoms. No. 59 (12th December, 1912), 1,320 fathoms. No. 110 (21st 
December, 1913), 157 fathoms. 
BAIRDIA FOVEOLATA G. S. Brady. 
Bairdia foveolata G. 8. Brady, 1867, Les Fonds de la Mer, vol. I, p. 56, pl. VU, 
figs. 4-6. Idem, 1880, Rep. Chall. Zool., vol. I, pt. III, p. 55, pl. VIII, figs la-f, 
2a-f. Idem, 1890, Trans. R. Soc. Edin., vol. XXXV, p. 493. Chapman, 1902, 
Journ. Linn. Soc. Lond. Zool., vol. XXVIII, p. 423. Idem, 1910, ibid, vol. XXX, p. 429. 
Observations.—The present examples show considerable variation in outline, 
but are all probably referable to the above species. One of them shows a dentated 
antero-ventral margin. The puncta are often large and surrounded by a whitened 
area. An abundant species in Southern seas; also found in the Atlantic, off Cape 
Verde. 
Occurrence—No. 29 (14th February, 1912), 125 fathoms. Additional sample 
(3rd September, 1912), 706 fathoms, 
